Question

three balls are drawn from an urn containing 6 red and 5 white balls all red is ​

Answer 1

Answer:

P( all red) = 6/11

Step-by-step explanation:

P = Event / Total possible outcomes

Total possible outcomes = 6 + 5 = 11

Event of choosing red = 6 times

Therefore

P(all red) = 6/11

Answer 2

Answer:

Total number of selections of three balls in which balls of both colours are drawn.

=2 red balls and 1 white balls +1 red ball and 2 white balls

=

8

C

2

×

5

C

1

+

8

C

1

×

5

C

2

=140+80=220

∴ Required probability

=

13

C

3

220

=

13×12×11

220×6

=

13

10